Click here for an old GRE practice exam [pdf]. This is the OLD math practice book (selected pages including practice exam). This isn't the "rescaled" test, so it is no longer distributed by ETS, but it's still the second-best practice exam for gaining experience.

Follow the link below to a free site for current and prospective math grad students, including posting of Q&A, advice and, perhaps most valuable, a self-reported listing of applicant profiles and admissions results. http://www.mathematicsgre.com/